logout.jsp

一个用JSP写的基于了B/S的图书馆管理系统

<%@ page contentType="text/html; charset=GB2312" %>
<%
String UserID = (String)session.getAttribute("UserID");
if(UserID==null)
{
  %>
<script language="javascript" type="">
  alert("您还有登录！");
  self.location("logon.jsp");
</script>
<% }else
{
  session.removeAttribute("UserID");
  %>
<script language="javascript" type="">
  alert("你已经成功注销！");
  self.location = "index.jsp";
</script>
<%}%>